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Removing crank without crank puller thread

DickieHDickieH Posts: 24
edited June 2011 in MTB workshop & tech
Hello Folks,

Im fixing up a battered old MTB for a mate on as little money as possible! I need to remove their warped chainset (square taper) and replace with a new one they have.

Here is the problem; on the driveside crank there is not enough decent thread for the crank extractor to grip on, the other side came off OK.

Can any expert out there suggest a method of removing this crank?

Cheers,

Dickie

Posts

  • AnonymousAnonymous Posts: 79,667
    Provided you definitely don't want the crank again, remove all fixing bolts, and ride it a bit, it should loosen off pretty quick.
  • tseniortsenior Posts: 664
    any ideas if you do want the crank again? i was thinking support the crank arm and try and punch the spindle out: BB is dead anyway...
  • AnonymousAnonymous Posts: 79,667
    tsenior wrote:
    any ideas if you do want the crank again? i was thinking support the crank arm and try and punch the spindle out: BB is dead anyway...
    Short of getting a bearing puller that could fit around it, no, sorry.
    If the crank arm is being used again, the threads should be fine, so why can't you use a crank extractor?
  • tseniortsenior Posts: 664
    left crank stuck on, threads gone

    would like to retrieve the cranks off a dead bike for a pub bike project for my bro, dont want to spend any money if possible.
  • DickieHDickieH Posts: 24
    @ Yeehaamcgee. I'll try your suggestion, many thanks for that. The chainset is totally screwed so i will discard it. Cheers.
  • supersonicsupersonic Posts: 82,708 Lives Here
    An angle grinder works great, and is fantastic fun!
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  • cooldadcooldad Posts: 32,599
    Gunpowder is even better.
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  • supersonicsupersonic Posts: 82,708 Lives Here
    Thermite does a pretty good job too:

    http://www.youtube.com/watch?v=C4oirelvw8M
    GT ZASKAR CARBON TEAM

    VOODOO CANZO

    Come and see me at https://www.facebook.com/biketyke/
  • SalsaSalsa Posts: 753
    When I had that problem I used to get two old cone spanners & a ball joint remover. Put a cone spanner against the bb & another against the crank arm (to protect the frame & arm), wedge the ball joint remover between them, then a sharp tap with a hammer & off it pops.
  • bellysbellys Posts: 456
    grinder
  • supafly1982supafly1982 Posts: 631
    Salsa wrote:
    When I had that problem I used to get two old cone spanners & a ball joint remover. Put a cone spanner against the bb & another against the crank arm (to protect the frame & arm), wedge the ball joint remover between them, then a sharp tap with a hammer & off it pops.


    i like this
  • Liam1611Liam1611 Posts: 191
    Just ride it around for a while without a bolt in the crank, after a few hundred turns the crank arm should work itself loose. Just don't stray too far from home.

    Regards

    Liam
  • Rick_hugginsRick_huggins Posts: 184
    I had to hacksaw one off my rockhopper last night as the threads were stripped; no good if you plan on keeping it tho
    Rockin': Specialized Rockhopper 2008
    Rollin': Orange 5 Custom
    http://www.bikeradar.com/forum/viewtopic.php?p=17023937#17023937

    Previous:
    Specialized Enduro Expert 2004
    Boardman HT Pro 2010
    Kona Stuff
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